Borussia Dortmund chief Hans-Joachim Watzke has confirmed the release clause in Marco Reus' contract that could see the midfielder leave Germany at the end of the season.

Reus is becoming one of Europe's most sought after players.

Reported interest from Arsenal, Barcelona, Manchester United and Paris Saint-Germain in the 24-year-old led to rumours that Reus had an escape clause embedded into his deal upon joining the club from Borussia Monchengladbach in the summer of 2012.

The Germany international has established himself as a mainstay in Jurgen Klopp's side, but Dortmund could be powerless to stop him accepting an offer from a rival club.

"Marco Reus possesses a release clause option in his current contract at our club," Watzke told SPORT1media. "He could leave our club due to that. He is, however, the only player in our first team squad that has such a contract clause."

Reus has a contract with Dortmund until 2017, but media reports suggest a figure of 35 million euros (29.4 million pounds) could see him leave before then.